Another interesting plot is the soul - swap. Imagine Naruto and Sasuke swapping souls. They have to deal with living in each other's bodies and understanding each other's perspectives in a very literal way. It leads to some hilarious and also very heart - warming moments as they learn more about each other.
Another unique idea is time - travel. There are fanfictions where Sasuke travels back in time and tries to prevent the tragedies that happened to his family. This creates a whole new set of interactions with Itachi and Naruto.
How about a story set in an alternate universe where Sasuke and Hinata are arranged to be married? Naruto then tries to break the arrangement because he realizes his true feelings for Hinata. This would create a whole new set of relationships and conflicts among the three.
One idea could be a time - travel fanfic where Sarutobi goes back in time and tries to prevent the rift between Naruto and Sasuke from ever happening. Another could be a fanfic where Naruto and Sasuke are transported to a parallel universe where Sarutobi is still alive and they have to work with him to get back home. Or a fanfic where Sarutobi trains Naruto and Sasuke together in a secret art that no one else in the village knows about.
One unique plot idea could be exploring an alternate universe where Sasuke has to protect Naruto in a more domestic setting, which is different from their usual ninja battles. Another could be Sasuke and Naruto having to work together to solve a mystery within the village that involves a new type of jutsu. And there could also be a plot where they go on a journey outside the village to find a rare herb that has special powers related to their friendship.
One unique plot idea could be Agent Naruto being sent on a mission to a modern - day world to stop a group of villains who are using ninja techniques for evil in a world not used to such powers. Another might be Agent Naruto having to team up with his own enemies from the Naruto universe, but in a different, more complex political setting within the fanfiction's world.
Perhaps there's a fanfiction where Naruto and Katara get transported to a different dimension. In this new world, they have to rely on each other completely to survive and find a way back home. They might face strange creatures and new forms of ninjutsu that they have to adapt to. This would really test their bond and show how well they can work together outside of their normal environments.
How about a story where an unknown enemy creates clones of them? Naruto, Sasuke, and Sakura have to not only fight these clones but also figure out who the enemy is and why they are being targeted. Along the way, they might discover new powers within themselves and also learn more about their relationships with each other.
One idea could be that as twins, they discover a hidden power that only they can access together. Maybe it's a special jutsu passed down in their family that requires their combined efforts. For example, they might be able to open a portal to a secret dimension filled with ancient ninja knowledge and powerful artifacts.
One idea could be that Naruto and Sasuke discover a hidden ancient jutsu that grants them immortality. They then use this newfound power to protect the ninja world from threats that are beyond normal shinobi capabilities. For example, they might face off against an otherworldly demon that is immune to normal attacks.
One idea could be exploring how Naruto and Sasuke's families interact in a modern AU. Maybe they are neighbors and their kids become friends, leading to some comical and heartwarming situations as the two dads, Naruto and Sasuke, try to deal with their kids' adventures.